Trolley-pole.



No. 730,116. PATENTED JUNE 2, 1903.

G. W. HAMILTON.

TROLLEY POLE. APPLICATION 21mm MAR. 2a. 1903.

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mus mzns 00.. PHOTouTnQ. wnsumowu n c v No. 730,116. PATENTED JUNE 2, 1903.

G. W. HAMILTON. TROLLEY POLE.

APPLICATION FILED MAR. 23. 1903.

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PATENT OFFIC GEORGE W. HAMILTON, OF PI-IILADELPHIA, PENNSYLVANIA, ASSIGNOR TO BURNHAM, WILLIAMS & COMPANY, OF PHILADELPHIA, PENNSYLVANIA, v

A FIRM.

SPECIFICATION forming part of Letters Patent No. 730,116, dated June 2, 1903.

Application filed March 23, 1903.

To all whom it may concern.

Be it known that I, GEORGE W. HAMILTON,

a subjectof the King of Great Britain and Ireland, (but having declared-my intention of becoming a citizen of theUnited States,) residing in Philadelphia, Pennsylvania,.have invented certain Improvements in Trolley- Poles, of which the following is a. specification.

The main object of'my invention is to construct a trolley-pole which will have an extended movement with alimited amount ofexpansion and contraction of the controllingspring.

A further object of the invention is to reduce the wear of the trolley-wheel.

These objects I attain in the following manner, reference being had to the accompanying drawings, in which v Figure 1 is a side view showing the improved pole raised to bear against a high wire. Fig. 2 is a view showing the pole lowered to bear against a low wire. Fig. 3 is an enlarged sectional plan view of the spring and its connections. Fig. 4 is a view showing the application of a compression-spring in place of the tension-spring illustrated in Fig. 1, and Fig. 5 is a view showing the pole provided with two trolley-wheels.

A is thebody of the car, on which is secured a bracket 0,. Arms B Bare pivoted at b b to the bracket a. In the present instance these arms have toothed segments 6, which mesh with each other, so that thearms will move in unison.

Pivoted to the upper ends of the arms B B at c are arms 0 0, connected togetherat their upper ends in the present instance by a pivotpin 01 of the trolley-wheel D. This trolleywheel can be shaped as desired. The four arms form one section of a lazy-tongs, so that the trolley-Wheel can have an extended movement from and toward the carbody to accommodate different heights pf'supply wire. This arrangement is a common construction and is known as the scissors type of trolley-pole; but the devices for keeping the trolley-wheel against the wire as heretofore manufactured have been such that it necessitated a very long movement of the spring,

Serial m. 149,070. (No man.)

which is highly objectionable for several reasons. 1

By my invention I am enabled .to use a spring having a very slight movement, and I can use the spring either under tension or compression.

Secured to the arms B B ate 6 are links E E, and secured to the arms 0 O at ff are links F F. These links are connected together by pivot-pins '11 7;, and extending from one pivot t' to the other is a spring G. One end of the spring-in the present instance is hooked around the head i of one'pin', and the opposite end of the spring isattached to a in Fig. 1 to the position shown in Fig. 2; butthere is sufficient movement to extend the pole without undue pressure, and 'yet when the pole is extended to a certain height the movement is limited.

I preferably mount the pivots e and f on sleeves which may beadj usted on their arms, and these'sleeves' can be secured after adj ustment by set-screws or other fastening devices.

, In Fig. A I have so proportioned the links that a compression-spring .must be used, as the distance apart of the pivot-points 'ii is greater when thepole is in its raised position than when it is in the depressed position. The spring G in this instance is mounted between two heads 72. h, and extending from each head is a tube carrying a telescopic section to hold the spring in line.

In order to enable high amperage currents I to be collected without the use of two poles, I mount two trolley-wheels D, D on abracket D carried by the arms 0 O, as shown in Fig. 5.

and the pole does not jump above the maximum height of wire when it leaves the same, and, furthermore, I reduce the wear on the trolley-wheel due to the even pressure on the wire.

The device is simple in construction, only one spring being necessary, and this spring may be either in tension or compression, according to the arrangement of the links.

I claim as my invention 1. The combination in a trolley-pole, of the two sets of armspivoted together, two sets of links connected to the arms, and a'spring connecting the two sets of links, substantially as described.

2. The combination of the two lower arms of a trolley-pole, two upper arms connected to the lower arms, the upper ends of the arms being connected together, two sets of links, one set being connected to the upper arms and the otherset being connected to the lower arms, the links of the upper arms being connected to the links of the lower arms, a spring connecting the two sets of links, and a trolley-wheel carried by the upper arms, substantially as described.

3. The combination in atrolley-pole, of two sets of arms pivoted together, two sets of links connected to the arms, and a spring connecting the links on one side to those on the opposite side, with means for adjusting the spring, substantially as described.

4. The combination inatrolley-pole, of two sets of arms pivoted together, two sets of links upper arms, two sets of links, one set being a connected to the upper arms and the other setconnected to the lower arms, the upper links being pivoted to the lower links, anda spring extending from the pivot on one side to the pivot on the other side, substantially as described.

6. The combination in atrolley-pole, of two lower arms, two upper arms pivoted to the lower arms, a trolley-wheel carried by the upper arms, two sets of links, one set being connected to the upper arms and the other set connected to the lower arms, the upper links being pivoted to the lower links, and a spring extending from the pivot on one side to the pivot on the other side, said links being adjustable on the arms, substantially as and for the purpose set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

GEORGE W. HAMILTON.

/Vitnesses:

WILL. A. BARR, J 0s. H. KLEIN. 

